کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8911926 1639049 2018 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Origin and implications of orbital-induced sedimentary cyclicity in Pliocene well-logs of the Western Mediterranean
ترجمه فارسی عنوان
منشاء و پیامدهای سیکلیس رسوبی ناشی از مدار در چاههای پیلوسان دریای مدیترانه
کلمات کلیدی
سیکلواستراتیگرافی پیلوسیس، آب و هوای مدیترانه ای، چرخه کربنات، شکل گیری سفروپل، اطلاعات خوب دریای مدیترانه رسوبی دریای مدیترانه،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی
Here we show that regular alternations in Pliocene downhole logs from the industrial drill-site Muchamiel-1, located along the Balearic Promontory in the Western Mediterranean, are related to eccentricity (bundles) and to obliquity and precession cycles (basic meter-scale alternations). We establish an astronomically based age model for the interval between 5.33 and 2.8 Ma, by first correlating cycle bundles to eccentricity and then the basic dominantly precession-related cycles to the 65°N summer insolation of La2004. The striking bed-to-bed similarities between the Muchamiel-1 well-logs and other records from both the Atlantic margin and the Central Mediterranean suggest that the same climatic forcing was responsible for the formation of carbonate cycles across the Western Mediterranean and adjacent Atlantic. We conclude that formation of alternating carbonate-rich/carbonate-poor beds was controlled by Western Mediterranean cyclogenetic mechanisms as well as by peri-Mediterranean precipitation associated with changes in the North Atlantic System (NAS). These findings highlight the importance of peri-Mediterranean precipitation on the sedimentary cyclicity by dictating terrigenous (clay) supply and potentially on the hydrology of the basin by providing additional freshwater required for sapropel formation. Consequently, cyclic sedimentation in the Mediterranean results from the combined effect of precipitation changes driven by (i) the North African monsoon, (ii) the Atlantic system, and (iii) intrabasinal Mediterranean atmospheric dynamics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 403, 1 September 2018, Pages 150-164
نویسندگان
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